Paper-finishing plate



C. W. COOK.

PAPER FINISHING PLATE.

APPLICATION FILED MAR- 5. 1919.

Patented Dec. 21, 1920.

Caro 600/0 7zve7t0 7 Giza ries Z0. 6 0076 i paper and passed State of Massachusetts,

I CHARLES .W. COOK, OF HOLYOKE, MASSACHUSETTS.

PAPER-FINISHING PLATE.

Specification of Letters IPatent.

Patented Dec. 21, 1920.

Application filed March 5, 1919 Serial No. 280,810.

T 0 all whom it may concern:

Be it known that I, CHARLES 'W. CooK, a'citizen of theUnited States, residing at Holyoke, in the county of Hampden and have invented new and useful Improvements in Paper-Finishing Plates, of which the following is a specification.

My invention relates finishing plates used to give fancy finishes to papers such, for example, as are used for writing paper, cover paper and the like.

It is common practice to use fabrics for giving a cloth like finish to writing paper. This is usually accomplished by making up what is termed a book comprising alternate layers of paper, cloth, and cardboard and then subjecting the same to high pressure in a plater press. The sheets of paper are then removed, the cloth, and the other which was in contact with the cardboard remaining smooth. This is an expensive process, special fabrics which are very costly being necessary, and the life of the fabric quite short as it soon loses it rough surface.

My finishing plate produces similar results at a lower cost and is not limited to to improvements in cloth finishes in the designs which maybe produced.

The invention comprises in general a finishing plate in which the desired pattern is impressed in a pyroxylin sheet backed up by cardboard or similar material. These plates are then interlocked between sheets of through a plater press as in the method using cloth.

To describe a specific application of my invention it will be assumed that it is desired to give a fabric finish to a sheet of paper. I first have a metal plate, such as steel, copper, or zinc, etched by well known methods to give a reproduction "of the desired fabric. A sheet of cardboard is then placed in a press and over the cardboard is placed a thin sheet of xylonite or other commercial form of pyroxylin product. The metal plate is then placed over the 'xylonite and the whole subjected to pressure and heat. The press is then opened and it will one side bearing the impression of ters Patent is finish on a sheet of paper,

he found that the impression has been transferred to the xylonite and cardboard. The heat has aided the xylonite in taking the impression and the cardboard serves as a base or reinforcing back. The heat and pressure unite the xylonite and cardboard, though a binder of some sort may be used.

The drawing represents a perspective of finishing plate, the im ression sheet being lifted from a portion 0 the cardboard base.

The surface of the xylonite is hard and the impression being sharply defined a plate of this character has a long life as compare with fabric or plates made up with a paste composition. ny other material having characteristics similar to pyroxylin may be employed, the term pyroxylin being used to indicate any pyroxylin-like material.

The metal plate is used to make up as many finishing plates as desired, twenty usually comprising a so-called book. The finishing plates thus made are then placed in a plater press with a sheet of paper between each plate and subjected to pressure. The book is then removed and the finished sheets taken out, unfinished sheets substituted and again run through the press. In this way the sheets of paper are given the desired finish.

The impression may be roduced on the pyroxylin sheet by means ot er than a metal late, as for example, pressing a piece of cloth directly against its sur a means of a metal plate any design may be produced.

What I claim and desire to secure by Let- 1. An embossing die used as a paper finishing plate and comprising a member of pyroxylin adapted to. indet or emboss a fancy finish .in the surface of a sheet of paper, said pyroxylin having substantially its entire surface impressed with high and low portions to impart said embossed finish to the surface of the paper.

2. A finishing plate for producing a fancy said finishing plate comprising a backing sheet of card board and a coverin of rox lin.

oiianfihs COOK,

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